# Glossary

## Bundler

Refers to module bundlers such as [Rspack](https://rspack.rs/) and [webpack](https://webpack.js.org/).

The main goal of bundlers is to bundle JavaScript, CSS, and other files together, and the bundled files can be used in the browser, Node.js, or other environments. When bundlers process web applications, they build a dependency graph and then combine each module into one or more bundles.

## CSR

CSR stands for "Client-Side Rendering". It means that the page is rendered in the browser using JavaScript, and logic such as data fetching, templates, and routing is completed on the client-side rather than the server.

In CSR, the server sends an empty HTML shell and some JavaScript scripts to the browser, and then the browser fetches data from the server's API and renders dynamic content to the page.

## Environment

The runtime environment for build output, see [Multi-environment builds](/guide/advanced/environments).

## Micro-frontend

Micro-frontend (MFE) is an architecture style similar to microservices. It is a composition of multiple independently delivered frontend applications, forming a cohesive whole. MFE decomposes frontend applications into smaller, simpler applications that can be developed, tested, and deployed independently while still appearing as a cohesive single product to users.

It primarily solves two problems:

- Maintaining large, complex applications becomes difficult over time.
- Cross-team collaboration inefficiencies.

## Modern.js

[Modern.js](https://github.com/web-infra-dev/modern.js) is an open source web engineering system from ByteDance that provides multiple solutions to help developers solve problems in different development scenarios.

## Module Federation

Module Federation is an architectural pattern for JavaScript application decomposition (similar to microservices on the server-side), allowing you to share code and resources between multiple JavaScript applications (or micro-frontends).

See [Module Federation](/guide/advanced/module-federation) for more details.

## Rspack

[Rspack](https://rspack.rs/) is a high-performance JavaScript bundler written in Rust. It offers strong compatibility with the webpack ecosystem, allowing seamless replacement of webpack, and provides lightning-fast build speeds.

## Rspress

[Rspress](https://github.com/web-infra-dev/rspress) is a fast static site generator based on Rsbuild.

## SSR

SSR stands for "Server-Side Rendering". It means that the HTML of the web page is generated by the server and sent to the client, rather than sending only an empty HTML shell and relying on JavaScript to generate the page content.

See [Server-side rendering (SSR)](/guide/advanced/ssr) for more details.

## SWC

SWC (Speedy Web Compiler) is a transformer and minifier for JavaScript and TypeScript written in Rust.

See [Configure SWC](/guide/configuration/swc) for more details.

## More

See additional glossary terms in [Rspack - Glossary](https://rspack.rs/misc/glossary).
